Potassium

Potassium is an essential electrolyte critical for maintaining cellular function throughout the body. It plays a vital role in nerve impulse transmission, muscle contraction, and maintaining the body's fluid balance. As the primary cation within cells, its precise concentration is tightly regulated, influencing heart rhythm and blood pressure. We measure potassium levels in the blood, recognizing that only a small fraction is circulating, with the majority stored inside cells. This measurement provides insight into overall electrolyte homeostasis.